Yarn cleaner and slub detector



Dec.'23, 1930. w.- MARCROFT ETAL' 1,785,817

YARN CLEANER AND .SLUB DETECTOR Filed Oct. 11, 1927 2 Sheets-Sheet l 1930- w. MARCROFT ET AL 1,735,817

YARN CLEANER AND SLUB DETECTOR Filed 001;. 11, 1927 2 Sheets-Sheet 2 Patented Dec. 23;,

Tan T STA-res PATENT OFFICE wIn IAi/rMAncn-oFT, or'cnANsToN, AND GEORGE N. TAYLOR, or EAST PROVIDENCE,

nI onE'IsLANn, ASSIGNORS To UNIVERSAL WINDING COMPANY, on nosToN, MASSA- CHUSETTS, A CORPORATION or MASSACHUSETTS YARN CLEANER AND SLUBTDETECTOR Application. filed October 11, '1927. Serial No. 225,549.

This invention relates to improvements in yarn-cleaners and slub-detectors for cleaning lint, fluff, specks, motes and other foreign matterrfrom yarn, thread or other filaments :5 and for detecting slubs and enlargements thereon. My improvedyarn-cleaner and slub-detector is adapted for use with winding machines and other textile apparatus to operate on the yarn, thread or other'strand as it feeds thereto in the various processes of conversion.

Av principal object of the invention is to provide a yarn-cleaner and slub-detector of the type specified for scraping lint and other adheringmatter from the yarn while also acting to detect the presence of a slub, bunch orenlargement on thestrand so that'it may I be removed before it passes into the product.

Another objectof the invention is to provide a device of the type specified which is adapted to cooperate with the stoppingmechanism of the machine to arrest'the' operation thereof by the detection of the slub or bunch without breaking the strandfeeding to the machine. I I

. Another object of the invention is to provide a device of the type specified which is adapted to clean the yarn on all sides and to detect slubsor enlargements which have been flattened lengthwise of the strand.

Another objec-t'oif the invention is to provide a deviceof the type specified which may be adjusted with accuracy and precision in accordance with thesize or thickness of the yarn to be operated up .Anothergob'ect of-the invention is to provide a device of the type specified of simple construction with its parts constructed of sheet-metal stampings to render it economical to manufacture.

Another object of the invention is to providea device of the type specified which is proof against derangement or getting out of order and durable in use'over long periods.

' Further objects'ofthe improvement are set forth in the following specification which describes a preferred embodiment of the invention as-illustrated by the accompanying drawings. In the drawings:

Fi lis view of a well-know y of plied to use therewith;

Fig. 2 is an enlarged perspective view of the improved yarn-cleaner and slub-detector;

Fig. 3 is a side elevation of the same showing its support or standard partly in section;

Fig. 4 is a plan view of the device; 1 Fig. 5 is a further enlarged plan View of the operating end of the device illustrating the means for adjusting the cooperative relation of the yarn-cleaning and slub-detecting members; and

Fig.6 is an enlarged detailed view of the adjusting-means.

Fig. 1 of the drawings illustrates a wellknown type of winding machine for winding yarn, thread and other filaments or fibers into cops or packages. While it is preferred to herein illustrate the improved yarn-cleaner and slub-detector in connection with a winding 'machine of this type it is to be understood that the device may be used with other forms of apparatus as employed in the various processes of converting, treating and transferring textile materials. It is also to be understood that the present invention is herein shown and described in a preferred form of construction by way of example only. it being susceptible of variations as required to adapt it to other types of machines or other methods of use.

In Fig. 1, 2 designates the frame of the winding machine which supports bearings for a rotatable winding-spindle or mandrel 3 on which the cop, cone or bobbin is wound. The

yarn, thread or other strand material is traversed longitudinally of the winding-spindle 3 by means of a reciprocating thread-guide 5 to deposit it in coils on the cop-tube or holder C. The thread-guide 5 is carried on a traverse-frame 6 which i-srnounted to swing on a pivot 7 whereby to allow the guide to move away from the axis of the windingspindle 3 as the cop or package is built up thereon. V

The winding mechanism is operated from power-driven means, such as a belt-pulley and clutch, not herein illustrated, and its operation is controlled from a starting-lever or handle 10. The starting-lever ,10 is'rocked into the position shown inFig. 1 to shift the clutch to start the operation of the machine, and'is maintained in this position tocontinue the winding operation through suitable as. tent-means as next described. The starting lever. carries a depending sickle-shaped arm 11 provided at itsend with a detent-latcl i 12 adapted to be engaged with a loclrQor shoulder 13 formed on an arm 14 prO ectmg up war-dly from a curved lever or quadrant The quadrant l5 ispivoted to the'side of the frame 2 at 16 and is normally held by gravity 3 to maintain itsdetent-shoulder 13 in engage.-

ment with the (latent-latch 12 on the arm.

11 or the lever 10.' The above-described ar rangement of the essential elements oi, the startingandstopping-mechanism of the machine are of well-known construction and. it

will be understood that when the outer end of the lever orquadran't15 is lifted the detents will'be released to effect the action of the stopping-inechanism to arrest the opera- 'tion of the machine. 1

The outer end of the quadrant carries a stop-lever or drop-wlre 17 pivoted on a screw 18 and having a depending arm 19 terminat ing in ahorizontal cross-bar 20 which is normally supported from the strandoi yarn g to maintain the stop-lever lll. suspensionas illustrated in Fig. 1.' The stop-lever 17, 1' preferably formed of wire, 1s or a bell-crank type having a second. arm 21e2itend1ng atsubstantlally right-angles to the arm 19 and connected thereto by a cross-strut or tie 22. The lower end of the arm 21 isjadapted to make contact with the serrated or toothed periphery of a wheel 23 which is continuously rotated during the operation of the winding machine. The wheel 23 is carried on he end of the rotating shaft 7 which forms the pivot for the swinging traverse-frame 6. The shaft 7 turns in the direction indicated by the arrow in Fig. 1 and drives the traverse cam, not herein shown, which recipro cates the thread-guide 5 by means of tne usual connections. It will be understood that when the bar.20 on the stop-lever 17 is released from the strand 3 due to its breakage or the exhaustion of the supply, the lever will rock under the action of gravity to cause'its-arm 21 to engage with'the toothed periphery of the wheel 23. The rotation of the Wheel'23 will tnereupon' act on the stop-lever 17 topry the outer end of the quadrant 15 upward ly whereby to release the detents to eilect arrest of the winding machine in the manner as well known tothose versed in the art. The

stop-lever 17 is formed with'another elbowshaped arm 24 by which it may be connected for operation from the slub-detector' of the present invention, these connections being as,

later described.

' As the yarn, thread or other strand mate'- rial -feeds to the winding-sp ndle, tension-1s applied thereto to resist its draft in accordance with the usual practice, any suitable fOZHTOf tension-device being employed for this purpose. Fig. 1 ofthe drawings illustrates a so-calledfinger-tension comprising two opposite plates or grid-s 25 formed with alternating bars 26 acrosswhich the strand 3 draws. ,The tension-plates orgrids 25 are "hinged ona rod 27 supported from aforked bracket 28 having maria attached to the frame 2 at 29. Suitable nieanasuch as illustrated in generalat 30, are employed for swinging one tenslon-grld 25 toward the other toa'dapttheir bars 26 to press against thestrand "y to causeit to follow a tortuous or sinuous course thereover whereby to apply l sistanceto its draft. "On'the top oi": the

bracket 28 is fastened aplatek33 having its forward edge-disposed'in position to cause the strand 3/ to draw thereacross as it travels between the tension-grids'25. A loop-like arm-or hook 34 reaches'up-across the'bar 20 on the stop-lever l'l' tolimit the swinging movement of the latter as the strand y-draws' thereunder. From the bar'20 the strand y leadsfup over a guide-pulley 35, thence down around a guide-rod 36, and drawing across the thread-bail 37 "on the traverse-frame 6, feeds through the thread-guide 5 to be def posited thereby'on thecop orb'obbin being The improved yarn-cleaner and slub-detector forming thesubject-matter of thepres ent invention may be applied to the winding machine in any desired position, and conveniently it is attached'to the top of the tensionbracket 28 to adapt it to act on the yarn or thread after the latter has drawn through the tension-device. For attaching-and supporting the device on the bracket 28 a mounting or standard 40 of sheet-metalis provided having a fiat rest or foot 41 formed with a slot 42, see Figs. 2 and3. The foot 41 rests against the top of the plate 33 and is secured in place by the screw or bolt 43 used to fastenthe plate to the bracket 28. The pivot rod 27 for the tension-grids 25 projects up through the slot 42 in the foot41- and serves as a dowel to hold extended to the right in a horizontal arm 48 havingits end portion 49 bent or folded back at an angle of forty-fi've' degrees, as shown most clearly in Figs. 4 and 5. This angular branch of the arm 48 forms the support-for an adjustable yarn rest or bearing-member 50 which cooperates with the movable slubflanges 52=overlappingthe edges thereof to detectorelelnent 65, to be later described, to 7 form a sliding support thereon, seeFigs. 3

I 50, see Fig. 6.

and 5. J ournalled ma hole 53 in the branch 49 is a stud 54 formed'with an eccentric bodyp'ortion 55 projecting. through a vertical slot 56 in the supporting arm 51 of the member I The stud 54 has ahead 57 formed with a hexagonal socket 58 and its opposite end is riveted over to form a flange 59 abutting the side of a dished spring-washer 60 which bears against the rearward side of the branch 49. Through this construction the member 50 is held frictionally against the faceof the branch arm 49,and by turning the stud 54 with a suitable wrench the member may be slid longitudinally of the arm to ad- I just its yarn-rests in cooperative relation with I respect to the slub-detector inthe manner as later explained.

The bearing-member or yarn-rest 50 is bent around at 61 to form. a horizontal arm 62 which extends at right-angles to the arm 48 on the standard or mounting 40. The arm 62 is split or sheared longitudinally to form a narrower strip 63 which is bent outwardly at an angle and then folded back in a part 64 which extends across and at right-angles to the main'arm. Through this construction the arm 62 provides a rest or bearing for the strand 3 disposed in one vertical plane while the auxiliary arm 64, extending thereacross, forms a bearing for the strand in a plane at right-angles to the main rest. These two yarn-rests 62 and 64 cooperate with two opposite strand-engagingedges of the detectormember 65 in the manner'as next explained.

The detector-element 65, which normally cooperates with the faces of the yarn-rests 62 and '64 to scrape lint and other accumulations from the strand material and to also At this end of the plate 65 is an integral strip 68 bent upwardly from its side and then folded over again in a smaller, flatplate 70 overlying the main plate in parallel spaced relation with respect thereto. The upper su'pplementaliplate 70 has its lateral edge 71 extending; parallelrwith and spaced away from the side of the yarn-rest 64 a distance equal to the spacebetween the end of the main plate 65 and the rest 62. It will thus beseen that the strand y drawing up between the outer edge of the plate 65 and the face of the rest 62 may be made to follow a course between the lateral edge of the plate 70 and the face of the rest 64. The purpose of this arrangement is to provide that the yarn shall be acted uponon all four sides as it draws between the detector-element and the fixed rests or bearing-faces whereby to more completely scrape and clean the yarn to remove all matter adhering thereto.

It will now be understood Why the adj usting-means for the member 50 is arranged at an angle to the arm 48. It has been explained that the member 50 is slidable on the branch 49 of the arm 48 in a plane disposed at an angle of forty-five degrees to said arm, and it will be seen therefore that when the member 50 is moved in either direction in this plane it will concurrently adjust the yarnrest 62 and the rest 64 respectively with the outer edge of the plate 65 and the lateral edge of the plate 70. In other words, the setting of the member 50 efiects a two-fold adjustment of its yarn-rests 62 and 64 with respect to the cooperating right-angled edges of the yarn-cleaning and slub-detecting element 65.

At the pivoted end of the plate 65 is a trigger-arm 72 bent downwardly at substantially right-angles to the plane of the plate. The lower edge of the arm 72 is adapted to engage over the upper edge of a pivotedtrip-lever 75 which is weighted at its opposite end. The trip-lever 75 is provided with ears 76 by means of which it is pivoted on a cross-pin 77 extending between the cars 46 and 47 on the standard 40. Extending rcarwardly from its pivot are two arms 78 formed by narrower strips of the sheet-metal stock twisted at right-angles to the plane of the main portion of the lever. A tubular-rod or pin 79 extends between the arms 78 and carries a cylindrical Weight 80 for counter-balancing the lever 75 to cause it to drop into the position illustrated by the dotted lines in Fig. 3 when the triggerarm 72 is released from its edge.

Hooked through the tubularaivet 79 is a wire rod 81, shown in Fig. 2, which is bent at right-angles to reach up to the drop-wire or stop-lever 17, see Fig. 1, to adapt it for connection therewith. The upper end of the rod 81 is bent into a loop 82 through which is hooked the end of the elbow-shaped arm 24 on the stop-lever 17. Thisloopedconnectionpermits the stop-lever 17 to move independently of the trip-lever when released by the break age or exhaustion of the yarn drawing across its bar 20, and also adapts the trip-lever 7 5 to move the stop-lever into engagement with the toothed wheel 23 when the trip-lever is released from the trigger 72 on the slub-detector The method of operation of the complete device as applied to use with the winding ma-I chine herein illustrated is asfollow-s f In preparing the win-ding'machine. for operation the strand yet yarn, thread or other material is led betweenthe tension-plates25; across the bail'or bar 20 on the stop-lever l7 and thence entered into the yarn-cleaner by.

drawing it upacross theside of the yarn-rest I 62 and directing it inback oi"- the edge 71 of the plate 70 on the slub detector65 to cause it to lead across the face of the auXilia'r itrl Thence the strand y passes up overthe guide-pulley 35, down around the guiderod 36, and to the thread-guide 5 in the manner as beforeexplain'ed. In Fig. 1 the winding machine is represented as having a conical tube C applied to the winding-spindle 3 and the end of the yarn is suitably attached to this tube or cop-holder in the usual manner. To start the winding the traverse-frame 6 is swung into position to bring the thread-guide 7 5 against the surface of thecone-holder or tube 0., and the starting-lever or handle 10 is ing across the bar of the stop-lever 17 main- I tains the latter suspended with its arm 21 free from contact with the stoppingwheel 23, so

- that normally themachine continues to wind as long thereto. p

As the strand g draws upwardly between the outer edge of the slub-detector and the face of the yarn rest 62 and also between the lateral edge 71 of the plate and the face of as it is supplied with yarn feeding the auxiliary rest 64 itisscrapedontoursides Y to remove any lint,fiuii', specks or motes adhering thereto. It will thus be observed thatany foreign substancesuch as lint, specks or motes which may have collected on the yarn and flattened thereagainst cannot escape the scraping surfaces on the four sides of the strand, the device being thereby much more elficient and'reliablei'or removing all'acc mulations from the yarn.

l Vhen a slub or bunch appears on the yarn i itwill pass first across the rest 62 and either engage the edge of the detector-element 65 or, failing in this, will passon to the rest 6% and engage the edge of the upper plate'TO. Th at is to say, should the slub or enlargement pass into the device in such position as to be flattened against the yarn-rest 62 so that it may escape engagement with the outer edge of the detector-element 65 it will pass on to the yarn- 7 rest 64in such manner asto invariably cause it to engage with the lateral edge 71 of the ing-lever lOto plate 70. Tlierefor'e, whenever a slub or one} largement engages with either detecting edge of the element 6.5;it will act-on said detector to swingthelatter upwardly .to permit the obstruction to pass thereby. As the 'detector65 1s swungupwardly in this niannerits tri gerarm 72 will be released from the, edge or the trip-lever75, thereby permitting the weighted end of the-lever to chop; Thedropping ofthe trip-lever 75 actsthroi'igh therodor link 81 to rock the stoprlever' 17 into engagement with. the periphery of: the! stopping lhestopp1ngdever 17 is thus;

wheel 23. caused to httthe'quadrant 15 to disengage the detents 12 and 13 whereby torelease the startto arrestv the operation of the Whole machine.

The stopping of the machine ispractically instantaneous so thatthe slub, bunch-or other enlargement can not pass-through the thread guide into the Winding, but may be readily discovered in theilen 1thofyarnextendine be cause the stopping-nieciianisin' operator isthus enabled to examine the length oi yarn containing the slub or enlargement and if necessary to break out a sectionthereoi and perfection. After the operation of the machine has-been arrested in the manneras above describedthe slub-detector is set for further operation by simply lifting the trip-lev'erlfi and engaging it with the trig 'erar'in 72;

i It willbe observed fromtheforegoing that the invention provides a particularly simple and eliicient device for cleaningyarnthread and other textile materia'ls' to remove lint;

ece up the material to remove the imflu fi and adhering matter therefrom, while i also detecting the presence of slubs and bunches which cannot be'scraped off from the strand. Upon the detection of a slub, bunch or other enlargement on the yarn the device acts automatically to arrest the operation of the machine without breaking the strand. This improved method of operation provides against unnecessary breaking out and Waste of material when the obstruction'in the yarn can be removed or reduced manually and thereby ellects asaving which is particularly i important when silk or other expensive ma terial is being operatedupon. Itj'also reduces the number oltsplices'and knots in the yarn and thereby improves the quality of the ultimate product for which the material is in tended. l c i It has been explained that the width of the slits or openings through which the strand passes may be adjusted by setting the yarir rest element 50, this adjustmenthaving a twofold eliiect andinsuring that thespac'es between the cooperative yarn cleaning element shall always be uniform and properly proportioned to the size of the yarn being operated upon. Moreover, since the direction of adjustment is at an angle offerty-five degrees to each adjusted'face the' present inrise - vment plvoted on sa1d standard andprovlded effect, a Vernier adjustment.

,The parts of the improved device may be constructed of sheet-metal to render them economical to manufacture andtheutter simplicity of the operating-mechanism not only reduces the cost-of manufacture, but tends to render it more eflic en't and rehable m use and less'liable to derangement or; getting out of order. T he arrangementofthe detector-member whereby it holds the trip-lever through themeans of itstrigger-arm results invery 7 little pressure being imposed onthe detector to resistits movement under the action of the slub on the yarn,and thus the devive is rendered extremely sensitive and quick of action in its control of'the stopping-mechanism of the machineto whichit is applied.

As a. further improvement, it is noted that the device may be readily cleaned to remove the accumulation. of lint and dirt by simply lifting the. detector-element 1 and wiping a the yarn-rests.

It has been noted that the presentimproved device is applicable to other uses than that herein shown anddescribed, and that its form and eonstructionmay bevvaried without departingfrom the spirit or scope of the inven- ,tion. Therefore without limiting ourselves in this respect, we claimzl Y 1. In a deviceof the type specified, the

combination of a :standard, a detector-element l pivoted on said standardand having a, yarn-engaging portion arranged parallel withjth'e vpivotalaxisof said element and a second yarn-engaging portion disposed at v substantially right-angles to. its axis, said detector-element being normally movableby thenengagement therewith of a slub or other enlargement on theyarn to permit the same 'to'pass through the device, a yarnreston the standard having angular faces disposed inparallel spaced relation with, respect to the yarn-engaging portions of the detector to provide crossing slits through which the yarn draws,.,and means to adjust the yarnresttoalter] the width of the slits.

, 1 2. In a "device of the type specified, the

combination'of a standard, a detector-elewith yarn-engagingedges disposed at substantiallyright-angles to. each other in different planes and adapted to be engaged vbyfaislub or other enlargement on the yarn tomove-said element, .a support on said standard disposed in ra-plane oblique tothe =yarn-engag1ng edgesr-of the. detector-element,

' yarn-restslidable onsaidsupport and provided: with P faces arranged ratan angle to each other, ,and means for attaching S2L1d- -yarn-rest tothe support with its angular faces adjusted in opposite spaced relation gaging faces extending at substantially right-angles to each other and arranged one in advance of the other, and a second member having corresponding angular yarn-engaging faces, said second member mounted to move'freely with respect to the first member and normally disposed with its angular faces in opposite spaced relation to the cor responding faces of the first member to adapt the yarn to draw through the openings between said faces to clean it on all sides, said movable member being displaceable by the engagement therewith of an enlargement' on the yarn to permit the enlargement to pass through the'openings without breaking the yarn.

ff. In a yarn-cleaner and slub-detector, the

combination of a relatively fixed member having yarn-engaging faces disposed at an angle to'each other and arranged one in ad of the fixed member to adapt the yarnito draw therebetween to clean it on all sides, said second member being mounted to move freely with respect to the fixed member when engaged by an enlargement on the yarn to separate the yarn-engaging faces to permit the enlargement to pass through the device without breaking the yarn.

5. In a yarn-cleaner and slub-detector, the combination of a relatively fixed member having yarn-engaging faces extending in planes at an angle to each other, and a member mounted normally free to move with respect to the fixed member and having portions arranged parallel with and spaced away from the yarn-engaging faces thereof ,to form slits through which the yarn draws to clean it on all sides, said movable memher being moved by the engagement therewith of an enlargement on the yarn to open the slits between the yarn-engaging faces whereby the enlargement will pass therethrough without breaking the yarn.

6. ,A yarn-cleaner and slub-detectorcomprising a relatively fixed element having yarn-engaging faces extending at rightangles to each other, a, second element constructed with angular faces corresponding to those of thefixed element, and means for pivotally. mounting, said; second element with its yarn-engaging faces in opposite spaced relation to those on the fixed element to form two/slits extending at right-angles to eaeh other through which the yarn draws, said pivoted element being adapted to be engaged by an enlargement on the yarn to move its q yarn-engaging aces away from the corre- V spending faces on the fixed element to perm t the enlar ement to ass throu h the device a a r v without breaking the yarn.

having two yarn-engaging faces extending at right-angles to each other and arranged one above the other, a second member mounted normally free to move with respect to the first member and having a face arranged parallel with, and spaced away from one of the faces of the fixed member and a portlon arranged thereabove and hav ng 1ts facespaced away fromthe other face of-the Qfiz-icd member, the yarn-engaging faces of the second member being adapted to be engaged by anenlargement ofthe yarn to move said member to carry itsfaces, 'away'ifrom the opposite faces of the fixed member whereby to permit the enlargement to pass through the device without breaking the yarn.

V 8. In a device of the'ty'pe specified, the combination of a relatively fixed member having yarn-engagmg faces arranged one member being adapted to be engaged. byan enlargement on the yarn to cause said member to be moved outfofnormal posit on and its faces dis laced laterall with'res ect to P y P those on the fixed member whereby the enlargementis permitted'to pass through the devicewithout breaking the yarn.

9. In a device of the type specified, the

combination of a fixed rest across which the -v yarn draws, a second rest arranged in advance of and extending at right-angles tothe first rest, a normally movable detector-ole ment having two yarn engaging faces arranged one in advance of the other and dis-' posed in opposite parallel relation with respect' to the fixed rests to form two slits through which the yarn draws, the faces on the second member being adapted to be engaged by an enlargement on the yarn to move said member to open theslits to permit the enlargement to pass through the device without breaking the yarn.

' 10. In a device of the type specified, the

' combination of a relatively fixed member having two yarn-engaging faces arranged one above the other and crossing each other atjlsubstantially right-angles, a slub detector pivoted at one end toadapt itto be tilted with respect to the fixed member and having its free end arranged in parallel spaoe'd'relation In a device of the type specified, the: combination of a relatively fixed member largement to with respect to one face of the fixed member and another. portion extending n parallel spaced relation with respect to the other face of thefixed member :whereby to form two slits through which the yarn draws, the: faces on the slub-detector being adapted to be engaged by anenlargement on theyarn to move said detector to open theslits to permit the enlar ement to pass'throughthe device without'breaking the yarn. r

11. In a device of. the type specified, the J combination of a relatively fixed member provided with two yarn-engaging faces extending at substantially right-angles to each other and arranged one in advance of the other, at;

plate pivotally mounted to adapt itto move withrespect to the fixedmember and having its free edge arranged in parallelispaced'relation .to one of the faces ofthe'fixed-member,

said plateiprovided withan overhanging per-u;

tion having its edge arranged in parallel spaced relation to the'other' face of 'tl1e fixed member whereby to provide two slits through which the yarn draws to clean it on opposite sides, the pivoted plate being adapted to be i engaged by an enlargement onthe y'arn to swing said plate to displace its yarn engagin g faces away from thecorresponding faces on the fixed member whereby to permit the en- I 7 pass through the device without I breaking the yarn. I I 12. In a device of the type specified, the combination of a relatively fixed, member having two yarnengaging faces disposed at substantially righteangles, and arranged one in advance of the other, a second member hav 'ing two angular faces corresponding to those of the first membenjmeans for pivotally mounting said second member with its an gular faces in spaced relation to" the corre-z sponding faces of the "fixed memberto provide crossing slits through which the yarn draws, the faces on the second member providing means for engaging a slub or other enlargementon the yarn on whichever side it may projectrand such engagement operating to move the pivoted member to openthe slits to permit the passage of' the enlargement without breaking the yarn, andmeans for yieldmgly maintaining said plvoted member in position with its faces in cooperative rela tion with those ofthe fixed member.

13. In a device of the type specified, the combination of a member having twoyarnengaging faces extendingat substantially right-angles to each other, a second member having two yarn-engaging faces extending at right-angles to each other, means for pivotally mounting the second member with its yarn-engaging faces in parallel spaced relation to the corresponding faces of the first member to provideslits through which' the yarn draws, and means for adjusting said membersrinta plane oblique to their opposed faces toregula-t'e the width of the slits in ac-',

'cordance with the size of the yarn drawing V therethrough, the faces on the pivoted memher being adapted to be engaged by an en-' largement on the yarn to move said member to open the slits to permit the passage of the enlargement therethrough without breaking the yarn. i

14. In a device of the'typespecified, the

V combination of a relatively fixed member having a'projecting arm and a second arm disposed above and crossing the first arm at substantially right-angles thereto, a platelike detector-element, and means for pivotally mounting said detector-element with one of its edges disposed in parallel spaced relation to the first arm of the fixed member and another edge disposed in parallel relation to the other arm of the fixed member whereby to provide crossing slits through which the'yarn draws, the edges of the detector-element being adapted to be engaged by an enlargement on the yarn to swingsaid element out of cooperative relationship with the fixedmember to permit the enlargement to pass through the device without breaking the yarn.

15. In a device .of'the type specified, the combination of a standard, a detector-element pivoted on said standard to normally move, freely with respectthereto and constructed with two yarn-engaging faces extending at substantially right-angles to each other, a thread-rest provided with two angularly disposed faces adapted to cooperate with the yarn-engagingfaces of the detectorelement to provide slits through which the yarn draws, andmeans for mounting said 'thread-rest on the standard to provide for V adjusting itsangular faces with respect to those on the detector-element to regulate the width of the slits therebetween, said movable detector-element having its edges disposed in position to be engaged by an enlargement on the yarn drawing through the slits to move said element to open the slits to permit the passage of the enlargement without breaking the yarn.

16. Ina device of the type specified, the combination of a member having two yarnengaging 'iaces disposed at substantially right-angles, a second member pivoted to adapt it to move with respect to the first memher and having two angular faces arranged engagement of an enlargement with one of 1ts faces.

In testimony whereof we hereunto aihx our signatures.

lVILLIAM MARCROFT. GEORGE N. TAYLOR. 

